Abstract
The commercial SAPO-34 zeolite with 0.38 nm pore size and ZIF-8 particles with 0.34 nm aperture size were separately dispersed into different polymer matrix, to prepare the mixed matrix membranes (MMMs) for gas separation. The dispersed situation of the SAPO-34 and ZIF-8 particles in matrix and the influence of the fillers on the separation performance of the membrane had been investigated in this study. The as-synthesized MMMs showed a better trade-off between permeability and selectivity than the pure polymer membrane and the performance could exceed or close to the upper bound line of polymer membrane for CO2 and CH4 separation. The CO2 permeability and CO2/CH4 ideal selectivity of the 6FDA-mDAT MMM containing 40 wt% SAPO-34 zeolite was 190 barrer and ca. 60, respectively. The 6FDA-TrMPD based MMMs containing 20 wt% ZIF-8 provided a permeability of C3H6 and an ideal selectivity of C3H6/C3H8 at 24 barrer and ca. 17, respectively. These separation performances were in a suitable agreement of the theoretical value from Maxwell model.
Highlights
Gas separation technologies are crucial for several industrial processes, including CO2 capture and storage (CCS), and olefin/paraffin separation
The permeation of C3H6 and C3H8 through the 6FDA-TrMPD/ZIF-8 matrix membranes (MMMs) was at 1 atm and 35−100°C
The initial ZIF-8 powder was treated by ball milling at 120 rpm for three days to eliminate the agglomeration effect of small particles
Summary
Gas separation technologies are crucial for several industrial processes, including CO2 capture and storage (CCS), and olefin/paraffin separation. The CO2 acts as an acid gas impurity of the natural gas could corrode the transport pipeline and reduce the heating value. Information Administration had reported that the consumption market of nature gas was 27.85 trillion cubic feet (TCF) in 2017, and it will up to 31.91 TCF in 2040. The world demand of propene was 114 million tons in 2015 and has growing at a rate of 5% annually (Christopher, et al, 2017). The urgent demand for CCS and propene production promotes the development and application of the related separation materials and technologies (Mondal, et al, 2012; Zhou, et al, 2018)
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